Sewing-machine motor.



No. 767,128. PATENTED AUG. 9, 1904.

' "HUI. YOUNG. SEWING MACHINE MOTOR.

I nrmouxox FILED emu-.6. 1903. 1 no MODEL.

UNITED STATES Patented August 9, 1904.

HOMER J. YOUNG, OF TOLEDO, OHIO.

SEWING-MACHINE MOTOR.

SPECIFICATION forming part of Letters Patent No. 767,128, dated. August9, 1904.

Application filed September 8. 1903. Serial No. 172,293. (No model.)

To all whom it may concern.-

Be itknown that I, HOMER J. YOUNG, a resident of Toledo, in the countyof Lucas and State of Ohio, have invented certain new and usefulImprovements in Sewing-Machine Motors, of which the following is aspecification.

This invention relates to improvements in sewing-machine motors, and hasreference more particularly to a motor designed for application to manyof the sewing-machines now in common use without reconstructing orsubstantially changing the machines, being therefore in the nature of anattachment, but embodying novel features of construction andarran'gement in itself.

Among the salient objects of the invention are to provide an extremelycompact structure so designed that it may be readily applied to asewing-machine as ordinarily constructed; to provide in conjunction withthe motor mechanism proper means for conveniently and reliably attachingor supporting the same from the sewing machine table, thereby avoidingthe necessity of constructing specially-shaped attachments for varioussewingmachine heads; to provide in a motor of the character referred tosimplified and improved details of construction, rendering the motormore compact, capable of being more cheaply manufactured and assembled,and at the same time possessing a higher efiiciency; to provide in aconstruction of the character referred to means for attaching the sameto the table of the sewing-machine, which attaching means are capable ofadjustment to compensate for slight variations in distance between thetable-top and needle-arm shaft of the machine; to provide an improvedconstruction and arrangement of the commutator mechanism, renderingthesame at once simple, compact, and capable of being convenientlyhoused; to provide in conjunction with a motor of the character referredto an improved form of brake, and in general to provide a simple andimproved construction of the character referred to.

To the above ends the invention consists in the matters hereinafterdescribed, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a View showing a fragmentary portion of thehead of an ordinary sewing-machine and my improved motor appliedthereto, the latter being shown principally in vertical axial section.Fig. 2 is a right-hand end elevation of the parts shown in Fig. 1, thecasing of the motor being, however, removed, except as to fragmentaryportions thereof through which the commutator-brushes extend. Fig. 3 isa plan View of the supporting-bracket, the relative positions of partsof the sewing-machine head being shown in dotted lines. Fig. 4: is aside elevation of the hand-brake detached. Fig. 5 is a top plan View ofthe brake member shown in Fig. 4 with connected parts in section. Figs.6 and 7 are details of the two forms of armature-disks.

Referring to the drawings, 1 designates as a whole the upright portionof a sewing-machine arm or head casting, 2 the bed-plate thereof, and 3a portion of the sewing-machine table upon which the head rests.

4c designates as a whole a supporting or attaching bracket, which bymeans of bolts 5, extending through the base portion 7 thereof, isrigidly secured to the sewing-machine table.

6 v designates clamping screws threaded through the base-flange of thebracket and arranged to impinge at their lower ends upon the uppersurface of the bed-plate of the sewing-machine head, the bracket beingshown as recessed at its under side, as indicated at 7 to receive theedge of the bed-plate beneath said clampingscrews. Said bracket isprovided with an integral standard 8, which is transversely aperturednear its upper end, as indicated at 9, to receive a clamping-bolt 1O.

11 designates as a whole a field member of the motor, the iron member ofwhich is in the form of a yoke, having the arms 12, curved to correspondto the periphery of the armature, and the shank portions 13, upon whichare mounted field windings or spools 14:. The yoke is provided at itslower end with an integral downwardlyextending lug l5, verticallyslotted, as indicated in dotted lines at 16, to receive theclamping-bolt 10 and to afford a limited vertical adjustment of the yokerelatively to the armature. In this connection it is to be noted thatthe aperture 9 through the the latter.

bracket 4 is of slot form and extends hori- Zontally or transverselyalso, as shown in dotted lines inv Fig. 2, thus providing for lateraladjustment of the yoke member. These two adjustments of the yoke make itpossible to keep the armature which is within the yoke in a perfectlyconcentric position relative to the shaft of the machine. The yoke-arms12 are of substantially uniform size in cross-section throughout theirlength, being shown as rectangular or oblong rectangular in crosssectionin the present instance, and in order to facilitate construction thestraight shank portions 13 are constructed to merge into the curved arms12 in the form of smoothly curved portions 17, the object of thisconstruc tion being to enable the field-windings to be first formed andthen slipped down over the arms into place. It is to be understood thatthe spools or field-windings 14 will be of what is known as the flexibletype, so as to bend sufiiciently to pass over the curved portions 12 and17. V I 18 designates the end of the main shaft of the sewing-machinehead, which projects from the sewing-machine arm and upon which ismounted the armature of the motor.

Describing the armature, 19 designates a sleeve fitted upon the end ofthe shaft 18 and, by means of a set-screw 2O rigidly secured to Upon thesleeve 19 is seated a brake-disk 21, provided with an integral sleeveextension 22, telescoping upon the ex: terior of the sleeve 19 andextending atone end slightly beyond the end of the sleeve 19. The sleeve19 is provided at its inner end with an annular conical shoulder 23,against which a correspondingly-shaped shoulder 24 ,upon the brake-diskabuts, and the sleeve extension of the brake-disk isprovided at itsouter end with a reversely-inclined conical shoulder 25, which isengaged by a correspondinglyshaped shoulder 27, formed upon aclampingscrew 26. r The clamping-screw 26 is externally threaded andarranged to fit within the correspondingly-threaded end of the sleeve19. It will be understood that the sleeve 19, with its inclined shoulder23, and the extensionits inclined shoulders 24 and 25 cooperating withthe clamping-screw 26, constitute a'wedging friction-clutch mechanism bymeans'of which the brake-disk is frictionally and effectively heldagainst rotation upon the sleeve 19 or maybe permitted to rotate thereonat will. By the use of the inclined or wedge-shaped shoulders a moreperfect, and therefore a more effective, frictional engagement betweenthe sleeve of the armature and the sleeve upon the machine-shaft issecured, and there is not the possibility of a working loose of thehandscrew as there is between a straight end-toend engagement with amuch less frictional surface. Describing the armature, 28 desig natesaseries of armature-disks arranged in register with each other, part ofsaid disks being in the form of open rings, as seen in detail, Fig. 7,and the remainder having spidershaped centers 29, as indicated indetail, Fig. 6. Thosemembers of the disks having the spider-shapedcenters constitute the supporting members for the remainder of thearmature, being to this end arranged in superposed order and fitted uponthe exterior of the sleeve extension 22 of the brake-disk and abuttingat one side against an annular shoulder 30 upon the said brake-disk. Theremaining disks are secured at either side of the supporting-disks andin register with the latter by means'of through-pins 31. In order thatthe armature may be. connected to rotate positively with the brake-disk,the supporting-disks 28 are provided with keyways 32, which engagecorresponding keys seated within the exterior of the extension-sleeve22. The windings 33 are of well-understood form and arranged to embracethe entire series of disks, as shown clearly in Fig. 1.,

The armature as a Whole is secured against endwise movement upon thesleeve 22- by means of a space-ring 34, which space-ring also serves thefunction of holding in position one set of the commutator-segments 35and for this purpose has its outer end of undercut form, as indicated at36. The commutatorsegments and intervening insulated blocks are arrangedin the usual manner and forms as a wholean annulus the inner baseportion of which is of dovetail construction, as shown clearly inFig. 1. The outer side of this annulus is engaged by means of aclamping-ring 37, which is threaded upon the exterior of the sleeveextension 22 of the brake-disk, as indicated clearly at 38. It will beunderstood from the foregoing description that this clamping-ring 37thus acts not only to confine the commutator-annulus, but also throughthe medium of the space-ring 34 to hold the supporting armature-disks inclamping engagement with the annular shoulder 30 hereinbefore referredto.

139 designates the commutator-brushes, arranged in radial relation tothe .commutator and seated to reciprocate in sockets 40, formed upon theouter casing 41 of the armature. The commutator-brushes are, as usual,insulated, from the sockets by means of tubularcov erings 42 and areheld in yielding engagement with the commutators by means of coiledsprings 43 interposed between the outer ends of the brushes and caps 44,threaded upon the outer ends of the sockets. The brushes are connectedin a usual manner with the fieldwindings, one such connection beingindicated at 45, and likewise the armature-windings are connected withthe commutators, as usual, one connection being indicated at 46.

47 and 48 designate the main conductors,

which will in use be connected with any suitand 48 being connected inthe present instance to the field-windings 14, as best shown in Fig. 2.

The casing 41 hereinbefore referred to is conveniently formed of sheetmetal and arranged to substantially inclose the outer or exposed side ofthe armature and field members. Conveniently the casing is secured inplace by means of one or more screws inserted therethrough and into theyoke member, as indicated at 49.

5O designates as a whole a brake-shoe member which ispivotally'supported at one end upon one of the yoke-arms, as indicatedat 51, and arranged to overlie the upper periphery of the brake-disk,being to this end curved to conform to the periphery of the brake-diskand provided with a V-shaped inner edge 52, which engages acorrespondingly shaped groove in the periphery of the disk. At its freeend the brake member 50 is bent radially outward and provided with ahandpiece 53, by means of which it may be manually depressed intobearing with the brake-disk. In order to hold the brake normally freefrom the brakedisk, a novel construction is provided comprising a stud54, rigidly connected with the yokearm and having a pivot extension 55,which is approximately half-round, as best seen in Fig. 4. Upon theupper side of the brake member is mounted a plate-spring 56, which atits free end overlies and bears upon the flattened side of the pivotextension 55, the relation of this flattened surface being such that thespring normally holds the brake-shoe slightly uplifted.

As afurther feature which may be employed or dispensed with at will Iprovide a footbrake member 57, pivoted at one end, as indicated at 58,to the power portion of one of the yoke-arms and arranged to underliethe lower periphery of the brake-disk and engage the latter in a mannersubstantially similar to the previously described brake member. Thebrake member 57 extends outwardly at its free end and is connected witha thrust-rod 59, which extends downwardly through a suitable aperture 60in the bracket 4 and through a subjacent table and is connected at itslower end with any suitable mechanism, by means of which it may beforced upwardly and apply the brake. The weight of the brake mechanismwill in this instance normally hold the brake out of bearing with thebrake-disk.

As a further feature of improvement I provide means for utilizing thecounter electromotive force generated by the running of the armatureafter the latter has been short-circuited and while current is stillpassing through the fields. To this end I provide upon field-piece 12,adjacent to the free end of the brake member 50, an insulatedcontactstud 60, upon which is mounted a spring-strip 61, extendingbeneath and adapted to cooperate with a second insulated contact-stud62,

mounted upon the brake member 50. The studs 60 and 62 are connected withthe respective windings of the field by means of conductors 63 and 64,so that when the contacts 61 and 62 are in bearing with each other thecurrent will be from one field-winding direct through said contacts tothe other and out, thus short-circuiting the armature. The contacts 61and 62 are so disposed relatively to each other that the electricalcircuit will be closed therethrough before the brake is appliedmechanically to the brake-disk. Accordingly the operator may use onlythe counter electromotive force for breaking the armature or may useboth this force and the mechanical friction in conjunction by forcingthe brake member into bearing with the brake-disk.

While I have herein shown and described what I deem to be the preferredembodiment of my invention, yet it will be understood that the detailsof construction may be modified Without departing from the spirit of theinvention, and I do not, therefore, limit myself to these details exceptto the extent that they are made the subject of specific claims.

I claim as my invention 1. In combination with a sewing-machine, anelectric motor and means for attaching the same to the sewing-machinecomprising a bracket adapted to be rigidly secured to the table of themachine and provided with a standard, an armature mounted concentricallyupon the sewing machine shaft and a field member rigidly and adjustablyconnected with the standard of said bracket with its field-piecesconcentric with the armature, substantially as described.

2. In combination with a sewing-machine, a motorarmature mounted uponthe main shaft thereof, a yoke-shaped field member and means for rigidlysupporting said field member in proper relation to the armaturecomprising a bracket having a base portion secured to the top of thesewing-machine table, a standard upon said bracket and a clampingboltsecuring the lower part of said field memher and bracket rigidly andadjustably together.

3. In combination with a sewing-machine and a motor-armature mountedupon the main shaft thereof, of a field member, and means for adjustablysecuring said field member in proper relation to the armature comprisinga bracket having a base portion adapted to be rigidly bolted to the topof the sewing-machine table, a standard upon said bracket, a slot-likebolt-aperture extending through said bracket, a similar slot-likeaperture extending through the field member, said slots being arrangedin transverse relation to each other and a clamping-bolt securing saidparts together whereby the field member is capable of adjustment in alldirections within a given plane.

4. In combination with a sewing-machine,

the main shaft thereof, a motor-armature mounted upon said main shaftand a field member, of means for rigidly supporting said field member indefinite relation to said armature and comprising a bracket having abase adapted to be rigidly secured to the sewing-machine table, one ormore clampingscrews threaded through said base and arranged to engage anunderlying portion of the bed-plate of the sewing-machine head, andmeans for adjustably but rigidly connecting the field member with saidbracket, substantially as described.

5. In an electric motor, the combination with a suitable armature, of afield member comprising an approximately Y-shaped yokepiece, the armswhereof are curved concentric with the periphery of the armature, andfieldwindings mounted upon each of said arms at points between thecurved armature-embracing portions and the point of union of said arms,said winding-supporting portions being united with thearmature-embracing portions by means of small and relatively slightcurved portions, and the yoke-arms being made of such size incross-section from the windingsupporting portions outwardly to theirends, whereby said windings may be threaded over the arms after thewindings are formed, as and for the purpose set forth.

6. In combination with a sewing-machine motor and the main shaftthereof, an electric motor mounted upon said main shaft and a fieldmember comprising a pair of yoke-arms ad justably arranged to extendconcentric with the periphery of the armature and field-windings uponsaid arms, said field-windings being arranged entirely removed from andbelow the armature whereby the diameter and height of the combinedarmature and field-pieces are reduced to a minimum, for the purpose setforth.

7. In a sewing-machine motor, the combination with an axially-disposedsleeve member and an armature mounted thereon and hav- 'ing windings ofthe Gramme type, of a commutator-annulus mounted upon said sleeve andextending in part beneath the windings of the armature, andcommutator-brushes arranged to extend radially, and inclined inwardly,to engage at their inner ends the commutator without interfering withthe windings, as and for the purpose set forth.

8. In combination with asewing-machine head and the shaft thereof, anelectric motor relatively connected with said shaft and provided with abrake-wheel, a brake-bar pivotally supported adjacent to the peripheryof said brake-wheel and provided with a handpiece located at that sideof the motor toward the operator, and means yieldingly holding saidbrake normally out of contact with the brake-wheel.

9. In a sewing-machine motor, the combination with the sewing-machinehead and the armature and brake-disk mounted thereon, of a field-pieceextending adjacent to the periphery of the upper half of the armatureremote from the operators side of the machine, a segmental-shaped brakemember pivoted to said field pieceand extending forwardly around theperiphery of the brake-disk and terminating at the operators side of thearmature, an outturned extension on said brake member terminating in ahandpiece, and a spring normally holding said brake member out ofbearing with the brake-disk,

10. In combination with the rotary armature of an electric motor and ayoke-shaped field-piece extending adjacent to the periphery of thearmature, a brake-disk connected to move with the armature, a pivot-studrigidly mounted upon the field-piece and extending at right angles tothe plane of the brake-disk, said stud being parti-circular andflattened at one side, a brake-bar pivotally mounted upon said stud andprovided with a plate-spring relatively engaging the flattened portionof said stud and normally holding the brake-bar in definite angularrelation to the latter, and means for depressing the free end of thebrakelgarkto bring it into bearing with the brake- 11. In an electricsewing-machine motor, means for breaking the armature electricallycomprising a manually-operable contact device, a relatively fixedcooperating contact device, and electrical connections forshortcircuiting the armature while retaining the circuit through thefields, substantially as described.

12. In an electric sewing-machine motor, the combination with abrake-wheel moving with the armature and a mechanical brake member orshoe adapted to be applied to the brake-wheel, of an electrical contactdevice moving with said brake member, a relatively fixed contact memberwith which the contact member of the brake-shoe is brought into bearingby a movement in the direction to apply the brake, and electricalconnections with said contacts whereby the armature is shortcircuitedwhile the fields are retained in circuit when said contact devices arebrought ders adapted to cooperate with the shoulders of the sleeve andhand-screw, respectively, and an armature mounted upon said brakedisk,substantially as described.

14:. In a sewing-machine motor, the combination with a main shaft, of asleeve rigidly mounted thereon provided at its inner end with an annularconical shoulder, a hand-screw threaded into the outer end of saidsleeve and provided with a reversely-inclined shoulder, a brake-diskprovided with a sleeve extension mounted upon said sleeve and havingshoulders adapted to cooperate with the shoulders of the sleeve andhand-screw, respectively, an armature mounted concentrically upon saidsleeve extension of the brake-disk and held against movement in onedirection by an annular shoulder, a space-sleeve upon said sleeveextension arranged to abut against the armature, and a clamping-ringthreaded upon the end of the sleeve extension and acting upon thespace-sleeve, substantially as described.

15. In a sewing-machine motor, the combination with a main shaft, of asleeve rigidly mounted thereon provided at its inner end with an annularconical shoulder, a hand-screw threaded into the outer end of saidsleeve and provided with a reversely-inclined shoulder, a brake-diskprovided with a sleeve extension mounted upon said sleeve and havingshoulders adapted to cooperate with the shoulders of the sleeve andhandscrew, respectively, an armature mounted concentrically upon saidsleeve extension of the brake-disk and held against movement in onedirection by an annular shoulder, a space-sleeve upon said sleeveextension arranged to abut against the armature, a commutator-annulusmounted upon said sleeve extension in bearing with one end of saidspace-sleeve, and a clamping-ring threaded upon the outer end of thesleeve extension and engaging the opposite side of saidcommutator-annulus, substantially as described. 16. In a sewing-machinemotor, the combination with the main shaft, of a sleeve rigidlymounted-thereon, provided at its inner end with an annular conicalshoulder, ahand-screw threaded into the outer end of said sleeve andprovided with a reversely-inclined shoulder, a brake-disk provided witha sleeve extension mounted upon said sleeve and having shoulders adaptedto cooperate with the shoulders of the sleeve and hand-screwrespectively, an armature mounted concentrically upon said sleeveextension of the brake disk and held against movement in one directionby an annular shoulder, a space-sleeve upon said sleeve extensionarranged to abut against the armature, a commutator-annulus mounted uponsaid sleeve extension in bearing with one end of said space sleeve and aclamping ring threaded upon the outer end of the sleeve extension andengaging the opposite side or said commutator-annulus, substantially asdcscribed.

HOMER J. YOUNG.

' Witnesses:

ALBERT H. GRAVES, FREDERICK C. GooDwIN.

